UPS backup power

[Kronk]

Originally Posted by Squiddy

I just put new batteries in a UPS that is rated for 240Watts and tried running my Seio powerhead off of it today (with all of the snow) and had issues. As soon as the UPS went from line power to battery power, I could hear the rotor clanking around so I immediately turned it off. I can't remember but I think I have tried running my recirc pump on a UPS before and had trouble.

I tried out my 350Watt APC and it ran a 403 powerhead with no problem. It did clank around a bit at first but it was the same sound i hear whenever i turn it off then back on. What brand of UPS is it ? you should check out a spec sheet online look for sine wave distortion and similar specs higher quality units should produce an excellent sine wave.